Process of manufacturing and finishing parchment-paper



' UNrTED STATES PATENT Ounce.

JACOB EISELSTEIN, OF EGG HARBOR CITY, NEW JERSEY.

PROCESS OF MANUFACTURING AND FINISHING PARCHMENI-PAPER.

SPECIFICATION forming part of Letters Patent No. 621,603, dated March 21, 1899. Application filed August 25, 1898. Serial No. 689,fi=53. (No specimens.)

T0 at whom it may concern.-

Be'it known that I, J ACOB EIsELsTEIN, a citizen of the United States, residing at Egg Harbor City, in the county of Atlantic, State of New Jersey, have invented a new and usef ul Improvementin Processes of Manufacturing and Finishing Parchment-Paper, which improvement is fully set forth in the following specification.

My invention consists of an improved process of manufacturing and finishing parchment-paper WherebyIam enabled to produce a superior article and .one which has marked advantages over the parchment-papers now in the market. To this end I first parchmentize the paper in the usual manner, and after the same has been Washed I pass it through a heated solution or bath composed of certain ingredients, to be hereinafter referred to in detail, the function of which is to fill the pin-holes in the paper and to give body thereto. The paper after passing through the solution or bath above referred to is run upon a drier, and from there it is conducted over a fricti'ongalender or a supercalender and submitted t9 another bath or solution while passing over the hot roll on the calender. The elements of the last mentioned bath serve to give a gloss to'the paper and to make the same transparent and in addition to keep the paper soft so it will not become brittle in passing through the calender, the finished-product being soft, glazed, and highly finished, which excellent properties it Will retain indefinitely.

The invention further consists of novel details in the process of manufacture, all as will be hereinafter fully set forth, and particularly pointed out in the claims.

In carrying out my invention I take paper which is parchmentized in the usual manner, and the same after being washed is passed through a heated solution or bath composed of dextrine, china-clay, glucose, and water,

the same being taken in substantially the following proportions: ten percent. dextrine, ten per cent. china-clay, ten per cent. glucose, and seventy per cent. water. The chinaclay and glucose are to be well mixed before being placed in the water,and the foregoing solution or bath must be hot, so that the paper will not be chilled before being run over the drier. The function of the dextrine and china-clay is to fill pin-holes in the paper, while the object of the employment of the glucose is to give body to said-paper. After the paper has been passed through the abovenamed' bath it is run over the drier and then over a friction-calender ora supercalender and treated to a solution of Wax or paraffin, silicate of soda, talc, oil, andglyc'erin while passing over the hot roll on the calender, the above ingredients being combined substantially as follows: five per cent. Wax or paraffin, ten per cent. silicate of soda, ten per cent.

talc, ten per cent. oil, and sixty-five per cent.

glycerin. The above solution is applied to the paper in any suitable manner, preferably by a woolen-cloth spreader or brush to distribute the same evenly on the roll, where it is forced into the paper by the heat of the roll over which the paper is passed. The paper is then turned and again passed through the calender to be treated on the other side thereof to the same s0lutionviz., wax or the last solution the wax or paraffin and silicate of soda give a gloss to the paper, while the function of the oil is to makefthe paper transparent, the talc to economize on glycerin, and the object of the glycerin is to keep the paper soft, so it will not become brittle in passing through the calender, the paper when treated and finished in the manner above described becoming soft, glazed, and highly. finished, which excellent properties are retained indefinitely. It will be apparent that by the foregoing steps a simple and expeditious process is attained, whereby paper thus treated is greatly superior to parchmentpaper produced in accordance with the usual process of manufacture.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is- 1 The herein-described process of treating paper which consists in passing the same first through a hot bath of dextrine, china-clay, glucose and Water, and next treating said ICQ ' paper with a solution of Wax or paraffin, silithence over a calender and lastly treating cate of soda, talc, oil and glycerin. said paper to a solution composed of Wax or 2. The process of treating paper which conparaffin,si1icate of soda, talc, oil and glycerin. 1o sists of parchinentizing the same, washing JACOB EISELSTEIN. 5 said paper, passing the latter througha heated WVitnesses:

solution of dextrine, china-clay, glucose and ROBT. A. MEIER,

water, running the paper upon a drier and JOHN A. WIEDERSHEIM. 

